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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Control System - 4.6L (LH2) - DTC P0690 To P2135) >> DTC P0690 >> Diagnostic Aids

Diagnostic Aids

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DTC P0690

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Control Module Connector End Views and Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze/Frame Failure Records.
Did the DTC fail this ignition?		 - Go to Step 3  Go to Intermittent Conditions
3
  1. Turn OFF the ignition.
  2. Remove the powertrain relay from the underhood fuse block with the J 43244  Relay Puller Pliers. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) .
  3. Probe either test point of the V8 ECM fuse with a test lamp that is connected to a good ground. Refer to Troubleshooting with a Test Lamp .
Does the test lamp illuminate on either test point of the fuse?		 - Go to Step 4  Go to Step 7 
4
  1. Turn OFF the ignition.
  2. Disconnect the engine control module (ECM) electrical connector that contains the ignition 1 voltage circuit from the V8 ECM fuse. Refer to Underhood Electrical Center or Junction Block Replacement .
  3. Probe either test point of the V8 ECM fuse with a test lamp that is connected to a good ground. Refer to Troubleshooting with a Test Lamp .
Does the test lamp illuminate on either test point of the fuse?		 - Go to Step 5  Go to Step 10 
5
  1. Turn OFF the ignition.
    2. NOTE: Refer to Test Probe Notice .
  2. Probe the ignition 1 voltage terminal at the powertrain relay location on the underhood fuse block with a test lamp that is connected to a good ground.
  3. Remove the following relays from the underhood fuse block, one relay at a time, while monitoring the test lamp.
    • S/P fan relay
    • Low speed fan relay
    • High speed fan relay
Does the test lamp go out when a relay is removed?		 - Go to Step 13  Go to Step 6 
6
  1. Turn OFF the ignition.
    2. NOTE: Refer to Test Probe Notice .
  2. Probe the ignition 1 voltage terminal at the powertrain relay location on the underhood fuse block with a test lamp that is connected to a good ground.
  3. Remove the following fuses from the underhood fuse block, one fuse at a time, while monitoring the test lamp:
    • V8 ECM fuse
    • Post O2
    • Odd coils fuse
    • Even coils fuse
    • Pre O2/CAM Fuse
Does the test lamp go out when a fuse is removed?		 - Go to Step 11  Go to Step 15 
7 Measure the resistance from terminal #30 of the powertrain relay to terminal #87 with a DMM. Refer to Troubleshooting with a Digital Multimeter .
Does the DMM display the specified value?		 infinity ohm Go to Step 8  Go to Step 12 
8 Measure the resistance from terminal #30 of the powertrain relay to terminal #85 with a DMM. Refer to Troubleshooting with a Digital Multimeter .
Does the DMM display the specified value?		 infinity ohm Go to Step 9  Go to Step 12 
9 Measure the resistance from terminal #85 of the powertrain relay to terminal #87 with a DMM. Refer to Troubleshooting with a Digital Multimeter .
Does the DMM display the specified value?		 infinity ohm Go to Intermittent Conditions Go to Step 12 
10 Test for shorted terminals and poor connections at the ECM electrical connectors. Refer to Testing for Intermittent Conditions and Poor Connections and Delphi Connectors (Micro .64) or Delphi Connectors (Micro-Pack 100W) or Delphi Connectors (Pull To Seat) or Delphi Connectors (Push To Seat) or Delphi Connectors (Weather Pack) or Delphi Connectors (12-Way) .
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
11 Repair the short to battery positive voltage in the ignition 1 voltage circuit that caused the test lamp to go out when the fuse for that circuit was removed. Refer to Wiring Repairs .
Did you complete the repair?		 - Go to Step 16  -
12 Replace the powertrain relay. Refer to Relay Replacement (Within an Electrical Center) or Relay Replacement (Attached to Wire Harness) .
Did you complete the replacement?		 - Go to Step 16  -
13 Replace the relay that caused the test lamp to go out when the relay was removed from the underhood fuse block.
Did you complete the replacement?		 - Go to Step 16  -
14 Replace the ECM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the underhood fuse block. Refer to Underhood Electrical Center or Junction Block Replacement .
Did you complete the replacement?		 - Go to Step 16  -
16
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Turn ON the ignition, with the engine OFF.
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze/Frame Failure Records.
Did the DTC fail this ignition?		 - Go to Step 3  Go to Step 17 
17 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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